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Improper mounting of lasers

SonicWaffles

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Nov 20, 2014
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I felt it might be valuable to share this as a new member to this hobby. I have taken laser safety very seriously, and own a pair of "Eagle Pair® 190-540nm & 800-1700nm OD5 Laser Safety Goggles" (the $65 option).

I am building my first laser using one of those $15 NICHIA M140 (A140?) diodes from ebay equipped with a linear regulator. I decided my desk was an appropriate place to breadboard test my circuit. In doing so, I had the diode mounted in a standard AixiZ module laying on the desk. When disconnecting everything after testing, the diode moved slightly and pointed the beam towards my body momentarily before powering off. I was not in the beam path at any point, and I was wearing the OD5+ goggles from survival lasers which are advertised as appropriate for that wavelength.

I have decided to not move forward with any future builds until I have a bench vice to hold things in place during assembly. I suppose this is the reason laboratory settings use a heavy metal table with bolts securing modules and optics in place. I should do the same to ensure safety during laser construction.
 



RedCowboy

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I like the linear motion mounts for our 12 and 20mm modules, you can mount them easily for your projects and they are inexpensive, also they make good thermal contact.

SANY5517.JPG
 

SonicWaffles

New member
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Nov 20, 2014
Messages
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RedCowboy,

I don't feel like making a new thread about this, so I will just tag it on here.

I got around to "modifying" my first laser purchased - a Dragon Lasers 35 mW Viper (Green). I assume it is a 532 nm laser source, but after checking the receipts, it doesn't explicitly say the wavelength. I work in a lab and might be able to find a CCD to test the actual emission, but that's neither here nor there.


I equipped my safety squints 😖 and pointed the laser through the goggles while recording. I noticed in using it earlier with my goggles, that I could see GREEN light through it. Judging by the OD rating at the indicated wavelengths, I should not see any green, correct? Even if this amateur modification allowed 1 W optical output power (which it definitely doesn't), the observed output power should only be 0.01 mW (dividing by 100,000).

My concern is that the color observed is green which should not be the case. If it was orange or something I would be satisfied because that would indicate fluorescence of the target material and thus diffuse non-laser light. Is it possible I got a defective pair of Eagles? Honestly I feel like asking for a refund and shelling out more for a pair from ThorLabs or Kentek. At least they have ANSI certification.
 

RedCowboy

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